Drill stem



Jan. 5, 1937. t v F. MILLER 2,066,794

I v DRILL STEM Filed Aug. 7, 1955 2 sheets-sheet 1 l l 415 f 24 O 42 7 51 r,/JZ Y 5 2M@ /f 51 F1 .-5.

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Jan; 5, 1937. y, F. MILLR v I 2,066,794

' DRILL STEMv Y Fild Aug. 7, 1955 2 sheets-smet 2 INVENTOR F1 .-4@ ma@ Patented r Jan. 5, 1937 PATENT-OFFICE DRILL STEM Frank Miller, Easton, Pa., assignorto Ingersoll- Rand Company, Jersey City, N. J., a corporation of -New .ersey Application August '1, 1935., serial No. 35,069

6 Claims.

more partlcularlyto a drilling device adapted to be'actuated by a rotary drilling rig.

One object of the invention is to enable the drilling of holes by-,means of a rotary drilling rig without necessitating frequent interruptions in the drilling operation for lengthening the drill rod whereby rotary motion is transmitted from the drilling rig to the cutting implement.

`Another object is to enable the drill rod,-where- Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specification and in which similar reference numerals re- -fer to similar parts,

Figure 1 is an elevation, in section, of a drillling device constructed in accordance with the practice of the invention, Y I

Figure 2 is a perspective view in elevation, partly broken away, of a portion of the drilling device,

AFigure 3 is a transverse view taken through Figure 1 on the line 3-3, and i Figure 4 is a view similar to Figure 1 showing a modified form of the invention.

Referring more particularly to the drawings,

and at first to Figures 1 to 3 inclusive, 20 designates a portion of a drillingrig illustrated as being of the rotary type, and 2| designates a drilling device constructed in accordance with the practice of the invention and interlockingly engaging the drilling rig 20.

The drilling device 2l comprises' a plurality of rod sections 22, 23 and 24 of progressively decreasing cross sectionin the order named and 4o adapted to be nested one within the other and freely-slidable with respect to each other. Iny the drawings three rod sections are shown, al-- though any suitable number of rods may be employed depending upon the distance which it is desired to penetrate the .Work or uponthe length of the several sections. The rod sections are shown as being of rectangular shape and in the form of the invention illustrated the rod 22, which constitutes the outermost section, is inrterlocked slidably with the drilling rig'20 so that,

inner surface 26 of .the rod 22 serves as a guiding (Cl. Z55-28) This invention relates to drilling devices, and

surface for the rod 23 or,'m`ore particularly, for' a flange 21 at the rear extremity and outer surface of the rod 23. The flange 21 may be an integral portion of the rod 23 or constitute a separate element which may be securedto' the rod, 5 as for instance by'welding. Thus, in the assembled positions of the rods the outer surface of the llange 21 will be in slidable engagement with the inner surface 26 of the rod 22 and the two rods will, therefore, be held against relative rotary 10 movement but will be capable of free slidable movement with respect to each other.

Additional guiding means are provided forthe rod 23 in the form of a flange 28 in the front end of the rod 22. The interior of the flange 28 de- 15 fines a guiding surface 29 for the rod 23 which may slide freely through the flange `28 and inter- `lockingly engages said flange to prevent relative rotary movement between the rodsk 22 and 23.

In order to limit the distance which the rod 22 may descend with respect to the drilling rig 20 the rod 22 is provided with an external shoulder 3| l adjacent its rear end to seat upon the driver 25, and thus prevent the rod 22 from sliding out of engagement with the drilling rig. 25

In the essential respects the rod 23 is a substantial duplicate of the rod 22. It differs therefrom principally in that it is of smaller cross sectional area. In other words, the rod 23 is provided at its forward end with an internal flange 30 3| dening a rectangular opening 32 to slidablyl engage and serve as a guide for thel innermost rod 24. The flange 3l, moreover, serves as an abutment for an external flange 33 on the rear end of the rod 24 to prevent removal of the rod` 35 24 from the rod 23. The outer surface of the flange 33 is slidably interlocked. withthe internal surface-of the rod 23 and thus, as will be apparent, a substantial larea of interlocking engagement will be maintained between the rods 24 and 23 to 40 assure the transmission of rotary movement from one rod to another.

Secured to thelowermost end of the rod 24 is a chuck 34 which may-be split longitudinally to provide a pair of half-sections 35. The sectlons 45 35 have longitudinally extending flanges 36 which, in the assembled position of the sections, lie in faceto face relationship and are clamped together by means of bolts 31 extending therethrough. The rearward portion of the sections 50 35 are'recessed to provide a rectangular bore 38 corresponding to the shape of the rod 24' which extends into the bore. In order to prevent endwise movement of. the 4,chuck with vrespect to the rod 24 these elements are preferably provided 55 with interlocking portions, as for example a rib 39 on the vchuck and a groove 40 in the outer surface of the rod 24.

On the lowermost end of the chuck 34 is a lateral flange 4I which serves as a seat for a cutting implement 42 secured to the flange by means of bolts 43. The cutting implement may be of any suitable type adapted for cutting rock, and in the rearward surface' of the cutting implement is a recess 44 to receive a boss 45 on the adjacent surface of the chuck 34 for centralizng the two with respect to each other. The recess 44 and the boss 45 are preferably also of polygonal `shape in order to form interlocking portions between the two transmitting rotary motion from the chuck to the working implement.

To the end that the drilling device, including the rods 22, 23, 24, the chuck and the working implement may be removed from the drill hole as a comparatively short unit, means are provided to move the rods telescopically into each other and thus shorten the assembly prior to its removal from the hole being drilled. To this end a pipe 46 is extended through the rods and the chuck 34 and terminates with its lower end within a recess 4T in the chuck.

On the portion of the pipe lying within. the recess 41 is a collar 48 which may be suitably affixed to the pipe 46 and seats against an antifriction thrust bearing 49 in the chuck 34. In drilling operations where it is essential to provide a clean Working surface for the cutting implement, as when drilling rock, the pipe 46 may also serve to convey cleansing liquid to the bottom of the hole being drilled. In such case the chuck 34 and the working implement are provided with passages 50 and 5 I respectively, which register with each other and with the interior of the pipe 46 for that purpose.

'Ihe operation of the device is as follows: After the rods 22, 23 and 24 are placed in position in the driver.25 of the drilling ring so that the rod 22 will be interlockingly engaged there- 26 and prevents further descending movementv of the rod 23. Thereafter, only the rod 24, the chuck and the working implement will descend into the work. This movement of these elements may continue until a -hole of the desired depth has been drilled or until the shoulder 30 of the rod 24A contacts with the flange 3|.

During this operation, and in the event that the working implement `has been employed for cutting rock, water under pressure may be introduced through the pipe 46 and the passages 50 and-,5l to the drill hole to flush the cuttings therefrom. After the drill hole has beeneompletediifting force is ,applied to theA pipe 46 and the4 working implement and the rod 24 are lifted until the. chuck engages .thefront end ofthe rod 23,. The rod i3/will then valsobe, carried upthe 22- when' the front end ofthe ro d22 .engages thechuck 34. the rod.22

" be carried upwardlyjntil the worklh-.s been removed from the drill hole. The chuck 34 may then be removed from the rod 24 and the rods be withdrawn from the driver 25 preparatory to moving the drilling apparatus to another site. y

As will be readily apparent to those skilled in the art, by employing a plurality of rod sections in which adjacent sections are in slidable and interlocking engagement with each other a preassembled rod capable of effecting the drilling of a comparatively deep hole may be employed in locations having low head room. This form of construction, moreover, eliminates the necessity of frequent prolonged idle periods of the drilling apparatus in order to add extensions to the drill rod as is customary in apparatus in which -the rod sections are threadedly connected tosoil overlying a rock bed, that is, for such forms of drilling in which it is not essential nor desirable to flush the loosened material from the hole being drilled. 'I'he chuck designated 52 secured to the lowermost end of the rod 24 is accordingly threaded, as at 53, forl the accommodation of a threaded shank of an earth auger 54 whereby the soil is loosened and elevated to the surface.

As in the form of the invention previously described the chuck 52 is provided with an antifriction thrust bearing 49 against which seats a collar'55 secured to the end of a flexible member 56 illustrated as a cable and extending through the rods connecting the chuck with the drilling rig. The cable 56, like the pipel 46, serves as a means for retracting the rods, the chuck and the auger 54 from the hole being drilled and, as will be readily understood, by seating the collars carried by the pipe 46 and the cable 56 against a thrust bearing the rotary motion of the chuck will not be transmitted to the cable or the pipe.

I claim:

1. A drilling device, comprising a plurality of rods nested one within the other and being freely slidable' with respect to each other, means for preventing rotary movement of one rod with respect to another rod, a Working implement carried by the innermost rod, and means for moving the rods into telescopic relationship with each other and to convey cleansing fluid to the working implement.

2. A drilling device, comprising a rotary rod, a second rod within and slidably interlocked with the first said rod, a working implement carried by the second mentioned rod, means extend-- Ving through the rods for moving the second mentioned rod into the first mentioned rod and for conveying cleansing fluid to the working implement, and means for preventing the transmission of rotary movement from the rods to the first mentioned means.y

working implement, an anti-friction bearing in 75 ing implementand acting against the anti-'friction bearing for drawing one rod into another.l

4. A drilling device, comprising a plurality of rotary rods nested one Withiny the other and being freely slidable with respect to each other, said rods having interlocking portions to prevent relative rotary movement between the rods, a chuck on the innermost rod tol accommodate a working implement, an anti-friction bearing in the chuck, a conduit within the rods for drawing one rod into another andy to convey cleansing fluid to such working implement, and means on the rod seating against the anti-friction bearing vto prevent the transmission of rotary movement from the rods to the conduit.

5. A drilling device comprising a plurality of rods arranged in telescopic fashion and having interlocking portions to prevent relative rotary Y. movement between the rods, said rods having external collars at only their uppermost ends and said rods, with the exception of the innermost rod, having internal collars .at only their lowermost ends, and a working implement carried by the innermost rod.

6. A drilling device comprising a plurality of rods arranged in telescopic fashion and having interlocking portions` to prevent relative rotary movement between the rods, a working implement carried by the innermost rod, said rods having external collars at only their uppermost ends and said rods, with the exception of the innermost rod, having internal collars at only `their lower-most ends, and means for lifting the working implement and for moving one rod into another. y

FRANK MILLER, 

